I get error “Remote XUL This page uses an unsupported technology that is no longer available by default in Firefox.” when I access email. How do I fix?

When version 17 was installed, a message briefly displayed that stated that 3 features would not be available, but I was not quick enough to note what they were. It was after that point that I started to get the “Remote XUL” error when I tried to access my email host via Firefox. I contacted my email host tech support (PureHost.com) and they were able to access my email without any problems. The tech used MS IE. I was also able to access my email with IE, but I prefer Firefox and have been using FF since vers. 2. What is “Remote XUL”, and what can I download to fix this problem without having to locate and install version 16 ?

When version 17 was installed, a message briefly displayed that stated that 3 features would not be available, but I was not quick enough to note what they were. It was after that point that I started to get the “Remote XUL” error when I tried to access my email host via Firefox. I contacted my email host tech support (PureHost.com) and they were able to access my email without any problems. The tech used MS IE. I was also able to access my email with IE, but I prefer Firefox and have been using FF since vers. 2. What is “Remote XUL”, and what can I download to fix this problem without having to locate and install version 16 ?